Question

Arrange the working of photo offset machine in the correct sequence.
A. The plate is placed into the printing press.
B. The ink is then transferred to a setting (soft) roller which will come into contact with paper and print.
C. The ink is received by the image on the plate and is rejected in the non exposed areas that receive water.
D. An electrostatic image of the document is transferred to a specially treated plate, then the plate is preserved through a process of heating and the application of chemicals.

• A. A, B, C, D
• B. D, A, C, B
• C. D, C, B, A
• D. C, B, D, A

Hint:

The key to "offset" printing is that the ink is not directly applied to the paper from the plate. It is first "offset" onto a rubber blanket/roller. The sequence is always: Create Plate \(\rightarrow\) Install Plate \(\rightarrow\) Ink Plate \(\rightarrow\) Transfer (Offset) to Paper.

Answer 1

The Correct Option is B

Let's break down the process of offset printing.
Step 1: Plate Creation. The first step is to create the printing plate.
D. An image of the document is created on a plate. This is the plate-making stage.

Step 2: Setting up the Press. The created plate is installed in the machine.
A. The plate is placed into the printing press.

Step 3: Inking the Plate. The press then applies ink and water to the plate. Offset lithography works on the principle that oil (ink) and water do not mix.
C. The image area on the plate accepts the ink, and the non-image area accepts water, repelling the ink.

Step 4: Printing. The image is transferred from the plate to the paper.
B. The inked image is transferred from the plate to a rubber blanket (setting roller), and then from the blanket to the paper. This is the "offset" step.
The correct logical sequence is D \(\rightarrow\) A \(\rightarrow\) C \(\rightarrow\) B.